Hi,
I hope you already have Exchange2010 SP3 installed if not please download SP3 (SP1 and SP2 are out of support). Install RU 14 after that.
https://www.microsoft.com/en-us/download/details.aspx?id=36768

With all things being equal Database portability is the fastest way to do it but mailboxes will be offline during the move. The sequence of tasks that need to take place:

- Dismount mailbox database on old server then Run eseutil /MH NAME.edb to confirm you have a clean shutdown.
- Create new mailbox store on New Exchange server and mount it, and Dismount the new mailbox store
- Then manually copy the old database to the new mailbox store database location (make sure it is the same name). Then Run the following command on new server Set-MailboxDatabase DBNAME -AllowFileRestore:$true
- Delete the transaction log files and checkpoint files for that database.
- Mount the store.
- Finally modify user account settings so user access points to the new mailbox server
Get-Mailbox -Database OLD_DB | where {$_ObjectClass -NotMatch
'(SystemAttendantMailbox|ExOleDbSystemMailbox)'} | Set-Mailbox -Database NEW_DB

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